CrystalSpace

Public API Reference

csutil/threading/barrier.h
00001 /*
00002   Copyright (C) 2007 by Marten Svanfeldt
00003 
00004   This library is free software; you can redistribute it and/or
00005   modify it under the terms of the GNU Lesser General Public
00006   License as published by the Free Software Foundation; either
00007   version 2 of the License, or (at your option) any later version.
00008 
00009   This library is distributed in the hope that it will be useful,
00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012   Library General Public License for more details.
00013 
00014   You should have received a copy of the GNU Library General Public
00015   License along with this library; if not, write to the Free
00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_CSUTIL_THREADING_BARRIER_H__
00020 #define __CS_CSUTIL_THREADING_BARRIER_H__
00021 
00022 #include "csutil/noncopyable.h"
00023 #include "csutil/threading/condition.h"
00024 #include "csutil/threading/mutex.h"
00025 
00026 namespace CS
00027 {
00028 namespace Threading
00029 {
00030   
00037   class Barrier : private CS::NonCopyable
00038   {
00039   public:
00043     Barrier (size_t maxCount)
00044       : maxCount (maxCount), currentCount (0)
00045     {}
00046 
00051     void Reset ()
00052     {     
00053       currentCount = 0;
00054     }
00055 
00060     bool Wait ()
00061     {
00062       MutexScopedLock lock (mutex);
00063       if (++currentCount < maxCount)
00064       {
00065         while (currentCount < maxCount)
00066           condition.Wait (mutex);
00067 
00068         return false;
00069       }
00070       else
00071       {
00072         condition.NotifyAll ();
00073         return true;
00074       }
00075     }
00076 
00077   private:
00078     Mutex mutex;
00079     Condition condition;
00080 
00081     const size_t maxCount;
00082     volatile size_t currentCount;
00083   };
00084   
00085 }
00086 }
00087 
00088 #endif

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